Indicative (8)

I believe the answer is:

telltale

(Other definitions for telltale that I've seen before include "Outward indication of something concealed" , "Blabber of secrets" , "Revealing or indicating something, like blabbermouth" , "Person who gossips or blabs secrets" , "Person who blabs or something that reveals" .)

I've seen this clue in the Universal.

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